int main(void)
{
    int dividend = 20;
    int divisor = 5;
    int result;

    asm(
        "divb %2\n\t"
        "movl %%eax, %0"
        : "=m"(result)
        : "a"(dividend), "m"(divisor)
    );
    printf("the result is:%d\n", result);
    return 0;
}